[rules-users] Temporal operators for point-in-time events

[Mike Melton]

Thank you, Edson.

I saw the written documentation but since the default after interval
is [1ms, infinity], I wanted to check for the specific [0, infinity]
case that there wasn't a better suited operator.

I do have a (somewhat related) question about the documentation when
compared to the diagram(s). Take, for example, the finishedby
operator. The documentation says "A finishedby B" means A starts
before B and A and B finish at the same time. However, the diagram
shows A starting *after* B and A and B finishing at the same time. The
other related operators (finishes, starts, startedby) all have the
same discrepancy. (Additionally, the second diagram in the
presentation includes a different definition for the finishes operator
than the first diagram. Maybe it should be startedby?)

My tests show me that the written documentation is correct and the
diagram is not. Unless I am reading the diagram incorrectly; if that
is the case, can someone explain it?

Thanks.


2011/12/13 Edson Tirelli <ed.tirelli at gmail.com>:
>
>    Your use of the after operator is correct. The documentation tells you
> about that, although in textual form:
>
> http://docs.jboss.org/drools/release/5.3.0.Final/drools-fusion-docs/html_single/index.html#d0e611
>
>    This presentation has the 2 tables of operators:
>
> http://www.slideshare.net/ge0ffrey/applying-cep-drools-fusion-drools-jbpm-bootcamps-2011
>
>     Edson
>
> On Tue, Dec 13, 2011 at 12:11 PM, Mike Melton <mike.melton at gmail.com> wrote:
>>
>> Apologies for the stupid question, but I haven't seen anything in the
>> documentation regarding this and I want to verify my solution. Say I
>> have a point-in-time event (i.e., duration of 0) that I want to
>> correlate to another point-in-time event. I want a rule that will
>> activate if the timestamp of one is greater than or equal to the
>> other, basically "after or coincides". I wrote a test using the
>> following rule and it seemed to work:
>>
>> rule "Greater Than or Equal"
>>  when
>>    $e1 : TestEvent( $id : id )
>>    $e2 : TestEvent( id != id, this after[0ms] $e1 )
>>  then
>>    System.out.println($e2 + " is greater than or equal to " + $e1);
>> end
>>
>> I realize this rule will fire twice if the event timestamps are equal,
>> but it's just for demonstration purposes; my question is specifically
>> about the "after[0ms]" part. Is this the way to go to accomplish what
>> I need? It seems so simple but I have this annoying feeling that I'm
>> missing something.
>>
>> On a slightly related topic, is there an updated version of the
>> temporal operators image from the Drools Fusion homepage? It is a
>> great visual description of the operators and I want to print it out
>> and post it at my desk, but it doesn't include all of the operators.
>>
>> Image:
>> http://www.jboss.org/drools/drools-fusion/mainColumnParagraphs/02/imageBinary/temporal-operators.png
>> >From page: http://www.jboss.org/drools/drools-fusion.html
>>
>> Thanks
>> Mike
>> _______________________________________________
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>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
>
>
> --
>   Edson Tirelli
>   JBoss Drools Core Development
>   JBoss by Red Hat @ www.jboss.com
>
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